net/ipv4/proc.c

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              This file implements the various access functions for the
   7  *              PROC file system.  It is mainly used for debugging and
   8  *              statistics.
   9  *
  10  * Authors:     Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  11  *              Gerald J. Heim, <heim@peanuts.informatik.uni-tuebingen.de>
  12  *              Fred Baumgarten, <dc6iq@insu1.etec.uni-karlsruhe.de>
  13  *              Erik Schoenfelder, <schoenfr@ibr.cs.tu-bs.de>
  14  *
  15  * Fixes:
  16  *              Alan Cox        :       UDP sockets show the rxqueue/txqueue
  17  *                                      using hint flag for the netinfo.
  18  *      Pauline Middelink       :       identd support
  19  *              Alan Cox        :       Make /proc safer.
  20  *      Erik Schoenfelder       :       /proc/net/snmp
  21  *              Alan Cox        :       Handle dead sockets properly.
  22  *      Gerhard Koerting        :       Show both timers
  23  *              Alan Cox        :       Allow inode to be NULL (kernel socket)
  24  *      Andi Kleen              :       Add support for open_requests and
  25  *                                      split functions for more readibility.
  26  *      Andi Kleen              :       Add support for /proc/net/netstat
  27  *      Arnaldo C. Melo         :       Convert to seq_file
  28  *
  29  *              This program is free software; you can redistribute it and/or
  30  *              modify it under the terms of the GNU General Public License
  31  *              as published by the Free Software Foundation; either version
  32  *              2 of the License, or (at your option) any later version.
  33  */
  34 #include <linux/types.h>
  35 #include <net/net_namespace.h>
  36 #include <net/icmp.h>
  37 #include <net/protocol.h>
  38 #include <net/tcp.h>
  39 #include <net/udp.h>
  40 #include <net/udplite.h>
  41 #include <linux/bottom_half.h>
  42 #include <linux/inetdevice.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/seq_file.h>
  45 #include <net/sock.h>
  46 #include <net/raw.h>
  47
  48 /*
  49  *      Report socket allocation statistics [mea@utu.fi]
  50  */
  51 static int sockstat_seq_show(struct seq_file *seq, void *v)
  52 {
  53         struct net *net = seq->private;
  54         int orphans, sockets;
  55
  56         local_bh_disable();
  57         orphans = percpu_counter_sum_positive(&tcp_orphan_count);
  58         sockets = percpu_counter_sum_positive(&tcp_sockets_allocated);
  59         local_bh_enable();
  60
  61         socket_seq_show(seq);
  62         seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n",
  63                    sock_prot_inuse_get(net, &tcp_prot), orphans,
  64                    tcp_death_row.tw_count, sockets,
  65                    atomic_read(&tcp_memory_allocated));
  66         seq_printf(seq, "UDP: inuse %d mem %d\n",
  67                    sock_prot_inuse_get(net, &udp_prot),
  68                    atomic_read(&udp_memory_allocated));
  69         seq_printf(seq, "UDPLITE: inuse %d\n",
  70                    sock_prot_inuse_get(net, &udplite_prot));
  71         seq_printf(seq, "RAW: inuse %d\n",
  72                    sock_prot_inuse_get(net, &raw_prot));
  73         seq_printf(seq,  "FRAG: inuse %d memory %d\n",
  74                         ip_frag_nqueues(net), ip_frag_mem(net));
  75         return 0;
  76 }
  77
  78 static int sockstat_seq_open(struct inode *inode, struct file *file)
  79 {
  80         return single_open_net(inode, file, sockstat_seq_show);
  81 }
  82
  83 static const struct file_operations sockstat_seq_fops = {
  84         .owner   = THIS_MODULE,
  85         .open    = sockstat_seq_open,
  86         .read    = seq_read,
  87         .llseek  = seq_lseek,
  88         .release = single_release_net,
  89 };
  90
  91 /* snmp items */
  92 static const struct snmp_mib snmp4_ipstats_list[] = {
  93         SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INPKTS),
  94         SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
  95         SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
  96         SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
  97         SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
  98         SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
  99         SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
 100         SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTPKTS),
 101         SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
 102         SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
 103         SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
 104         SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
 105         SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
 106         SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
 107         SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
 108         SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
 109         SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
 110         SNMP_MIB_SENTINEL
 111 };
 112
 113 /* Following RFC4293 items are displayed in /proc/net/netstat */
 114 static const struct snmp_mib snmp4_ipextstats_list[] = {
 115         SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
 116         SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
 117         SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
 118         SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
 119         SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
 120         SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
 121         SNMP_MIB_ITEM("InOctets", IPSTATS_MIB_INOCTETS),
 122         SNMP_MIB_ITEM("OutOctets", IPSTATS_MIB_OUTOCTETS),
 123         SNMP_MIB_ITEM("InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
 124         SNMP_MIB_ITEM("OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
 125         SNMP_MIB_ITEM("InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
 126         SNMP_MIB_ITEM("OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
 127         SNMP_MIB_SENTINEL
 128 };
 129
 130 static const struct {
 131         const char *name;
 132         int index;
 133 } icmpmibmap[] = {
 134         { "DestUnreachs", ICMP_DEST_UNREACH },
 135         { "TimeExcds", ICMP_TIME_EXCEEDED },
 136         { "ParmProbs", ICMP_PARAMETERPROB },
 137         { "SrcQuenchs", ICMP_SOURCE_QUENCH },
 138         { "Redirects", ICMP_REDIRECT },
 139         { "Echos", ICMP_ECHO },
 140         { "EchoReps", ICMP_ECHOREPLY },
 141         { "Timestamps", ICMP_TIMESTAMP },
 142         { "TimestampReps", ICMP_TIMESTAMPREPLY },
 143         { "AddrMasks", ICMP_ADDRESS },
 144         { "AddrMaskReps", ICMP_ADDRESSREPLY },
 145         { NULL, 0 }
 146 };
 147
 148
 149 static const struct snmp_mib snmp4_tcp_list[] = {
 150         SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
 151         SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
 152         SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
 153         SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
 154         SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
 155         SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
 156         SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
 157         SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
 158         SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
 159         SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
 160         SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
 161         SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
 162         SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
 163         SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
 164         SNMP_MIB_SENTINEL
 165 };
 166
 167 static const struct snmp_mib snmp4_udp_list[] = {
 168         SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
 169         SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
 170         SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
 171         SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 172         SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 173         SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
 174         SNMP_MIB_SENTINEL
 175 };
 176
 177 static const struct snmp_mib snmp4_net_list[] = {
 178         SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
 179         SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
 180         SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
 181         SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
 182         SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
 183         SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
 184         SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
 185         SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
 186         SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
 187         SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
 188         SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
 189         SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
 190         SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
 191         SNMP_MIB_ITEM("PAWSPassive", LINUX_MIB_PAWSPASSIVEREJECTED),
 192         SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
 193         SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
 194         SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
 195         SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
 196         SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
 197         SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
 198         SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
 199         SNMP_MIB_ITEM("TCPPrequeued", LINUX_MIB_TCPPREQUEUED),
 200         SNMP_MIB_ITEM("TCPDirectCopyFromBacklog", LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG),
 201         SNMP_MIB_ITEM("TCPDirectCopyFromPrequeue", LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE),
 202         SNMP_MIB_ITEM("TCPPrequeueDropped", LINUX_MIB_TCPPREQUEUEDROPPED),
 203         SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
 204         SNMP_MIB_ITEM("TCPHPHitsToUser", LINUX_MIB_TCPHPHITSTOUSER),
 205         SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
 206         SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
 207         SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
 208         SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
 209         SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
 210         SNMP_MIB_ITEM("TCPFACKReorder", LINUX_MIB_TCPFACKREORDER),
 211         SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
 212         SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
 213         SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
 214         SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
 215         SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
 216         SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
 217         SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
 218         SNMP_MIB_ITEM("TCPLoss", LINUX_MIB_TCPLOSS),
 219         SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
 220         SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
 221         SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
 222         SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
 223         SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
 224         SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),
 225         SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
 226         SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
 227         SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
 228         SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
 229         SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),
 230         SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
 231         SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
 232         SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
 233         SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
 234         SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
 235         SNMP_MIB_ITEM("TCPAbortOnSyn", LINUX_MIB_TCPABORTONSYN),
 236         SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
 237         SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
 238         SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
 239         SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
 240         SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
 241         SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
 242         SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
 243         SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
 244         SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
 245         SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
 246         SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
 247         SNMP_MIB_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
 248         SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
 249         SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
 250         SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
 251         SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
 252         SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),
 253         SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),
 254         SNMP_MIB_ITEM("TCPDeferAcceptDrop", LINUX_MIB_TCPDEFERACCEPTDROP),
 255         SNMP_MIB_SENTINEL
 256 };
 257
 258 static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
 259                              unsigned short *type, int count)
 260 {
 261         int j;
 262
 263         if (count) {
 264                 seq_printf(seq, "\nIcmpMsg:");
 265                 for (j = 0; j < count; ++j)
 266                         seq_printf(seq, " %sType%u",
 267                                 type[j] & 0x100 ? "Out" : "In",
 268                                 type[j] & 0xff);
 269                 seq_printf(seq, "\nIcmpMsg:");
 270                 for (j = 0; j < count; ++j)
 271                         seq_printf(seq, " %lu", vals[j]);
 272         }
 273 }
 274
 275 static void icmpmsg_put(struct seq_file *seq)
 276 {
 277 #define PERLINE 16
 278
 279         int i, count;
 280         unsigned short type[PERLINE];
 281         unsigned long vals[PERLINE], val;
 282         struct net *net = seq->private;
 283
 284         count = 0;
 285         for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
 286                 val = snmp_fold_field((void __percpu **) net->mib.icmpmsg_statistics, i);
 287                 if (val) {
 288                         type[count] = i;
 289                         vals[count++] = val;
 290                 }
 291                 if (count == PERLINE) {
 292                         icmpmsg_put_line(seq, vals, type, count);
 293                         count = 0;
 294                 }
 295         }
 296         icmpmsg_put_line(seq, vals, type, count);
 297
 298 #undef PERLINE
 299 }
 300
 301 static void icmp_put(struct seq_file *seq)
 302 {
 303         int i;
 304         struct net *net = seq->private;
 305
 306         seq_puts(seq, "\nIcmp: InMsgs InErrors");
 307         for (i=0; icmpmibmap[i].name != NULL; i++)
 308                 seq_printf(seq, " In%s", icmpmibmap[i].name);
 309         seq_printf(seq, " OutMsgs OutErrors");
 310         for (i=0; icmpmibmap[i].name != NULL; i++)
 311                 seq_printf(seq, " Out%s", icmpmibmap[i].name);
 312         seq_printf(seq, "\nIcmp: %lu %lu",
 313                 snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INMSGS),
 314                 snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INERRORS));
 315         for (i=0; icmpmibmap[i].name != NULL; i++)
 316                 seq_printf(seq, " %lu",
 317                         snmp_fold_field((void __percpu **) net->mib.icmpmsg_statistics,
 318                                 icmpmibmap[i].index));
 319         seq_printf(seq, " %lu %lu",
 320                 snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
 321                 snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTERRORS));
 322         for (i=0; icmpmibmap[i].name != NULL; i++)
 323                 seq_printf(seq, " %lu",
 324                         snmp_fold_field((void __percpu **) net->mib.icmpmsg_statistics,
 325                                 icmpmibmap[i].index | 0x100));
 326 }
 327
 328 /*
 329  *      Called from the PROCfs module. This outputs /proc/net/snmp.
 330  */
 331 static int snmp_seq_show(struct seq_file *seq, void *v)
 332 {
 333         int i;
 334         struct net *net = seq->private;
 335
 336         seq_puts(seq, "Ip: Forwarding DefaultTTL");
 337
 338         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 339                 seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
 340
 341         seq_printf(seq, "\nIp: %d %d",
 342                    IPV4_DEVCONF_ALL(net, FORWARDING) ? 1 : 2,
 343                    sysctl_ip_default_ttl);
 344
 345         for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
 346                 seq_printf(seq, " %lu",
 347                            snmp_fold_field((void __percpu **)net->mib.ip_statistics,
 348                                            snmp4_ipstats_list[i].entry));
 349
 350         icmp_put(seq);  /* RFC 2011 compatibility */
 351         icmpmsg_put(seq);
 352
 353         seq_puts(seq, "\nTcp:");
 354         for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
 355                 seq_printf(seq, " %s", snmp4_tcp_list[i].name);
 356
 357         seq_puts(seq, "\nTcp:");
 358         for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
 359                 /* MaxConn field is signed, RFC 2012 */
 360                 if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
 361                         seq_printf(seq, " %ld",
 362                                    snmp_fold_field((void __percpu **)net->mib.tcp_statistics,
 363                                                    snmp4_tcp_list[i].entry));
 364                 else
 365                         seq_printf(seq, " %lu",
 366                                    snmp_fold_field((void __percpu **)net->mib.tcp_statistics,
 367                                                    snmp4_tcp_list[i].entry));
 368         }
 369
 370         seq_puts(seq, "\nUdp:");
 371         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 372                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 373
 374         seq_puts(seq, "\nUdp:");
 375         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 376                 seq_printf(seq, " %lu",
 377                            snmp_fold_field((void __percpu **)net->mib.udp_statistics,
 378                                            snmp4_udp_list[i].entry));
 379
 380         /* the UDP and UDP-Lite MIBs are the same */
 381         seq_puts(seq, "\nUdpLite:");
 382         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 383                 seq_printf(seq, " %s", snmp4_udp_list[i].name);
 384
 385         seq_puts(seq, "\nUdpLite:");
 386         for (i = 0; snmp4_udp_list[i].name != NULL; i++)
 387                 seq_printf(seq, " %lu",
 388                            snmp_fold_field((void __percpu **)net->mib.udplite_statistics,
 389                                            snmp4_udp_list[i].entry));
 390
 391         seq_putc(seq, '\n');
 392         return 0;
 393 }
 394
 395 static int snmp_seq_open(struct inode *inode, struct file *file)
 396 {
 397         return single_open_net(inode, file, snmp_seq_show);
 398 }
 399
 400 static const struct file_operations snmp_seq_fops = {
 401         .owner   = THIS_MODULE,
 402         .open    = snmp_seq_open,
 403         .read    = seq_read,
 404         .llseek  = seq_lseek,
 405         .release = single_release_net,
 406 };
 407
 408
 409
 410 /*
 411  *      Output /proc/net/netstat
 412  */
 413 static int netstat_seq_show(struct seq_file *seq, void *v)
 414 {
 415         int i;
 416         struct net *net = seq->private;
 417
 418         seq_puts(seq, "TcpExt:");
 419         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 420                 seq_printf(seq, " %s", snmp4_net_list[i].name);
 421
 422         seq_puts(seq, "\nTcpExt:");
 423         for (i = 0; snmp4_net_list[i].name != NULL; i++)
 424                 seq_printf(seq, " %lu",
 425                            snmp_fold_field((void __percpu **)net->mib.net_statistics,
 426                                            snmp4_net_list[i].entry));
 427
 428         seq_puts(seq, "\nIpExt:");
 429         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 430                 seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
 431
 432         seq_puts(seq, "\nIpExt:");
 433         for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
 434                 seq_printf(seq, " %lu",
 435                            snmp_fold_field((void __percpu **)net->mib.ip_statistics,
 436                                            snmp4_ipextstats_list[i].entry));
 437
 438         seq_putc(seq, '\n');
 439         return 0;
 440 }
 441
 442 static int netstat_seq_open(struct inode *inode, struct file *file)
 443 {
 444         return single_open_net(inode, file, netstat_seq_show);
 445 }
 446
 447 static const struct file_operations netstat_seq_fops = {
 448         .owner   = THIS_MODULE,
 449         .open    = netstat_seq_open,
 450         .read    = seq_read,
 451         .llseek  = seq_lseek,
 452         .release = single_release_net,
 453 };
 454
 455 static __net_init int ip_proc_init_net(struct net *net)
 456 {
 457         if (!proc_net_fops_create(net, "sockstat", S_IRUGO, &sockstat_seq_fops))
 458                 goto out_sockstat;
 459         if (!proc_net_fops_create(net, "netstat", S_IRUGO, &netstat_seq_fops))
 460                 goto out_netstat;
 461         if (!proc_net_fops_create(net, "snmp", S_IRUGO, &snmp_seq_fops))
 462                 goto out_snmp;
 463
 464         return 0;
 465
 466 out_snmp:
 467         proc_net_remove(net, "netstat");
 468 out_netstat:
 469         proc_net_remove(net, "sockstat");
 470 out_sockstat:
 471         return -ENOMEM;
 472 }
 473
 474 static __net_exit void ip_proc_exit_net(struct net *net)
 475 {
 476         proc_net_remove(net, "snmp");
 477         proc_net_remove(net, "netstat");
 478         proc_net_remove(net, "sockstat");
 479 }
 480
 481 static __net_initdata struct pernet_operations ip_proc_ops = {
 482         .init = ip_proc_init_net,
 483         .exit = ip_proc_exit_net,
 484 };
 485
 486 int __init ip_misc_proc_init(void)
 487 {
 488         return register_pernet_subsys(&ip_proc_ops);
 489 }
 490